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Question
Which compound in the following pair will react faster in SN2 reaction with OH−?
CH3Br or CH3I
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Solution
In the SN2 mechanism, the reactivity of halides for the same alkyl group increases in the order. This happens because, as the size increases, the halide ion becomes a better leaving group.
R−F << R−Cl < R−Br < R−I
Therefore, CH3I will react faster than CH3Br in SN2 reactions with OH−.
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